I don't thing that it is a matter of the 280s "kicking-in" around 6000 rpms. Put 280s on your car, and I doubt you'd fare much better.

With the modifications that you have made to your head and intake, you are most likely flowing far too much air for the stock turbo in the upper rpms, especially at 26 psi. Basically you're overspooling your turbo, which makes it less efficient, which is probably why your friend is pulling on you past 6K rpms. A small turbo upgrade such as the White Rabbit or 20g-9 turbo should take care of the power drop past 6K.

l8r)

 

I can't wait to put my 280s in.

 

My 280s will be going in in a week or so. I cant wait to see what results I get.

 

What a worthless comparison. Two completely different cars.

 

It also could be as simple as cam gears settings. Too bad you don't know your own settings.

 

Let me know how much improvement you get

 

Just curious ... For the people who have posted here, are you running your 272/280 cams with stock or upgraded springs and retainers?

 

HKS 280 cams, supertech valve train.

l8r)

 

48 more hours to go till the results come in